During a google of all things kilt, I found this...

"Under the kilt are a pair of short trousers, called trews, made of thick cloth, and similar to schoolboys' short trousers."

Where the heck did they get that info from? Here's the link to the site...

http://www.uk.filo.pl/scotland_culture.htm

The dot PL domain is Poland. Anyone here from Poland?